Whenever you upload a video to YouTube and publish, if you’ve connected your Twitter account to your YouTube account, a tweet on behalf of you will be automatically shared on Twitter, that’s completely fine, but the following is not.

Prevent YouTube from posting Tweets to Twitter when you add new videos to a Playlist

When you create a new playlist and add one or more videos to it, each video you’ve added to the playlist will be informed to your followers on Twitter with an update like this: ‘I added a video to a @YouTube playlist http://youtu.be/Tp..<video title>‘. The list of tweets posted by YouTube in your Twitter timeline may annoy users following you, to avoid this from happening in future